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When room temperature drops below the temperature
selected on the thermostat, the furnace will be
switched on automatically. When room temperature
reaches the degree selected on the thermostat, the
furnace will be switched off automatically.
Some thermostats have a FAN switch with 2 selections,
AUTO and ON. When thermostat is set to AUTO, the
furnace blower cycles on and off, controlled by the
thermostat. In ON position, the furnace blower runs
continuously. This keeps the temperature level in your
home more evenly balanced. It also continuously filters
the indoor air.
OFF
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SHUTTING DOWN YOUR FURNACE
Should you need to shut down your furnace for service
or maintenance, you will need to turn the furnace off.
The following procedures must be followed:
! WARNING
Turn off electrical power supply to your furnace
before removing the access door to service or perform maintenance. Failure to follow this warning
could result in personal injury or death.
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90
50
! CAUTION
Although special care has been taken to minimize
sharp edges, be extremely careful when handling
parts or reaching into the furnace.
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50
70
SYSTEM
COOL OFF HEAT
FAN
AUTO ON
FILTERING OUT TROUBLE
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A dirty filter will cause a loss of airflow in your duct system.
When excessive loss of airflow occurs, the furnace may
cycle on the safety controls. If this condition is left unattended, the furnace will eventually lockout. It is recommended that the furnace filter be checked every 3 or 4 weeks
and cleaned if necessary.
1. Set your room thermostat to the lowest temperature
setting. (See Fig. 16.)
2. Close the external manual gas valve.
(See Fig. 9.)
3. Turn off electrical supply to the furnace.
(See Fig. 17.)
4. Remove furnace access door.
(See Fig. 11.)
5. Turn control knob on the gas valve to OFF position.
(See Fig. 18.)
6. Replace furnace access door. (See Fig. 13.)
7. If the furnace is being shut down because of a
malfunction, call your dealer as soon as possible.
! CAUTION
Never operate your furnace without a filter in place.
Doing so may damage the furnace blower motor.
An accumulation of dust and lint on internal parts
of your furnace can cause a loss of efficiency.
The air filter is normally located in the blower compartment.
(See Fig. 3 or 4.) If filter has been installed in another location, contact your dealer for instructions. To inspect, clean
and/or replace the air filter(s), follow these steps:
1. Turn off electrical supply to the furnace. (See Fig. 17.)
2. Remove furnace access door. (See Fig. 19.)
3. Remove blower access panel. (See Fig. 20.)
! CAUTION
Furnace is not to be installed, operated, and then
turned off and left turned off in an unoccupied
structure during winter. (See winterizing procedures in maintenance section).
NOTE: It will be necessary to remove 1 screw.
• FILTER(S) LOCATED IN BOTTOM:
1. Slide filter retainer sideways until it is free of latch. (See
Fig. 21 and 22.)
• FILTER LOCATED IN SIDE:
1. Remove filter retainer from latch. (See Fig. 23.)
2. Gently remove filter and carefully turn the dirty side up
(if dirty) to avoid spilling dirt from the filter.
(See Fig. 24.)
3. Inspect the filter. If torn, replace it.
PERFORMING ROUTINE MAINTENANCE
With proper maintenance and care, your furnace will operate economically and dependably. Instructions for basic
maintenance, which can easily be followed, are found on this
and the following pages. However, before beginning maintenance, follow these safety precautions:
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